Female North Korean soldiers patrol along the banks of Yalu River, near the North Korean town of Sinuiju...

Female North Korean soldiers patrol along the banks of Yalu River, near the North Korean town of Sinuiju, opposite the Chinese border city of Dandong, April 11, 2013. South Korea and the United States were on high alert for a North Korean missile launch on Thursday as the hermit kingdom turned its attention to celebrating its ruling Kim dynasty and appeared to tone down rhetoric of impending war. REUTERS/Jacky Chen (NORTH KOREA - Tags: POLITICS MILITARY ANNIVERSARY TPX IMAGES OF THE DAY)

RTX11GKR

July 08, 2013

A North Korean soldier holds an umbrella as she stands guard along the banks of the Yalu River, near...

A North Korean soldier holds an umbrella as she stands guard along the banks of the Yalu River

A North Korean soldier holds an umbrella as she stands guard along the banks of the Yalu River, near the North Korean town of Sinuiju, opposite the Chinese border city of Dandong, July 8, 2013. REUTERS/Jacky Chen (NORTH KOREA - Tags: MILITARY ENVIRONMENT TPX IMAGES OF THE DAY)

RTX120SD

July 27, 2013

Female North Korean soldiers parade to mark the 60th anniversary of the signing of a truce in the 1950-1953...

Female North Korean soldiers parade to mark the 60th anniversary of the signing of a truce in the 1950-1953...

Female North Korean soldiers parade to mark the 60th anniversary of the signing of a truce in the 1950-1953 Korean War at Kim Il-sung Square, in Pyongyang July 27, 2013. REUTERS/Jason Lee (NORTH KOREA - Tags: POLITICS MILITARY TPX IMAGES OF THE DAY ANNIVERSARY)

RTX121G7

July 27, 2013

North Korean men look at members of a military band as they wait for the opening ceremony of the Victorious...

North Korean men look at members of a military band as they wait for the opening ceremony of the Victorious Fatherland Liberation War Museum, in Pyongyang July 27, 2013. North Korea is celebrating the 60th anniversary of the signing of a truce in the 1950-1953 Korean War. REUTERS/Jason Lee (NORTH KOREA - Tags: POLITICS MILITARY TPX IMAGES OF THE DAY)

RTX121B5

July 27, 2013

North Korean female soldiers salute a figure of North Korea founder Kim Il-sung during the opening ceremony...

North Korean female soldiers salute a figure of North Korea founder Kim Il-sung in Pyongyang

North Korean female soldiers salute a figure of North Korea founder Kim Il-sung during the opening ceremony of the Victorious Fatherland Liberation War Museum, in Pyongyang July 27, 2013, as part of celebrations ahead of the 60th anniversary of the signing of a truce in the 1950-1953 Korean War. REUTERS/Jason Lee (NORTH KOREA - Tags: POLITICS MILITARY TPX IMAGES OF THE DAY)

RTR30R9D

April 15, 2012

Soldiers stand in front of the podium with portraits of North Korea founder Kim Il-sung (L) and the late...

Soldiers stand in front of the podium with portraits of North Korea founder Kim Il-sung and the late...

Soldiers stand in front of the podium with portraits of North Korea founder Kim Il-sung (L) and the late leader Kim Jong-il after a military parade to celebrate the centenary of the birth of Kim Il-sung in Pyongyang April 15, 2012. REUTERS/Bobby Yip (NORTH KOREA - Tags: POLITICS MILITARY ANNIVERSARY)

RTX1100X

June 25, 2013

A North Korean soldier stands guard along the banks of the Yalu River, near the North Korean town of...

A North Korean soldier stands guard along the banks of the Yalu River, near the North Korean town of Sinuiju, opposite the Chinese border city of Dandong, June 25, 2013. REUTERS/Jacky Chen (NORTH KOREA - Tags: MILITARY)

RTR30R8E

April 14, 2012

Female soldiers carrying a flag march past the podium during a military parade to celebrate the centenary...

Female soldiers carrying a flag march past the podium during a military parade to celebrate the centenary...

Female soldiers carrying a flag march past the podium during a military parade to celebrate the centenary of the birth of North Korea founder Kim Il-sung in Pyongyang April 15, 2012. REUTERS/Bobby Yip (NORTH KOREA - Tags: POLITICS MILITARY ANNIVERSARY)

RTR2CG3U

April 05, 2010

North Korean soldiers joke while guarding the banks of the Yalu River near the North Korean town of Sinuiju,...

North Korean soldiers joke while guarding the banks of the Yalu River near the North Korean town of Sinuiju...

North Korean soldiers joke while guarding the banks of the Yalu River near the North Korean town of Sinuiju, opposite the Chinese border city of Dandong April 5, 2010. REUTERS/Jacky Chen (NORTH KOREA - Tags: POLITICS MILITARY IMAGES OF THE DAY)

RTXV5NW

November 28, 2010

A North Korean soldier stands guard on the banks of the Yalu River near the North Korean town of Sinuiju,...

A North Korean soldier stands guard on the banks of the Yalu River near the North Korean town of Sinuiju...

A North Korean soldier stands guard on the banks of the Yalu River near the North Korean town of Sinuiju, opposite the Chinese border city of Dandong, November 27, 2010. The United States and South Korea began joint military exercises in waters west of the Korean Peninsula on Sunday in the face of opposition by regional giant China and threats of "consequences" from North Korea. Picture taken November 27, 2010. REUTERS/Stringer (NORTH KOREA - Tags: POLITICS)

RTR2GRGM

July 26, 2010

Female North Korean soldiers wave to a Chinese boat for tourists on the banks of Yalu River near the...

Female North Korean soldiers wave to a Chinese boat for tourists on the banks of Yalu River

Female North Korean soldiers wave to a Chinese boat for tourists on the banks of Yalu River near the North Korean town of Sinuiju July 27, 2010. REUTERS/Jacky Chen (NORTH KOREA - Tags: MILITARY SOCIETY IMAGES OF THE DAY)

RTR30PP3

April 14, 2012

Soldiers run into a stadium to join a ceremony, attended by North Korea leader Kim Jong-un, in Pyongyang...

Soldiers run into a stadium to join a ceremony, attended by North Korea leader Kim Jong-un, in Pyongyang April 14, 2012, one day before the centenary of the birth of North Korea founder Kim Il-sung on Sunday. REUTERS/Bobby Yip (NORTH KOREA - Tags: POLITICS MILITARY)

RTR243RW

May 31, 2009

A female North Korean soldier guards the banks of the Yalu River near the Chongsong county of North Korea...

A female North Korean soldier guards the banks of the Yalu River near the Chongsong county of North Korea opposite the Chinese border town of Hekou, northeastern China's Liaoning province May 31, 2009. U.S. Defense Secretary Robert Gates said on Saturday the United States would not accept a nuclear-armed North Korea and he warned Pyongyang against transferring nuclear material overseas. REUTERS/Jason Lee (NORTH KOREA POLITICS MILITARY IMAGES OF THE DAY)

RTR2CDXG

April 03, 2010

A female North Korean soldier guards the banks of the Yalu River near the North Korean town of Sinuiju,...

A female North Korean soldier guards the banks of the Yalu River near the North Korean town of Sinuiju...

A female North Korean soldier guards the banks of the Yalu River near the North Korean town of Sinuiju, opposite the Chinese border city of Dandong, April 3, 2010. A train thought to be carrying Kim Jong-il to China appears to have be a cargo freighter on a journey unrelated to the reclusive North Korean leader, witnesses at the border said on Saturday. REUTERS/Jacky Chen (NORTH KOREA - Tags: POLITICS MILITARY)

RTXOVMB

May 29, 2009

A North Korean woman and soldiers look at a Chinese tour boat from the banks of the Yalu River near the...

North Korean woman and soldiers look at a Chinese tour boat from the banks of the Yalu River near the...

A North Korean woman and soldiers look at a Chinese tour boat from the banks of the Yalu River near the North Korean town of Sinuiju, opposite the Chinese border city of Dandong, May 28, 2009. Key powers on the U.N. Security Council have agreed in principle that North Korea must face sanctions for defying a U.N. resolution with its second nuclear on Monday, Western diplomats said. REUTERS/Jason Lee (NORTH KOREA POLITICS MILITARY IMAGES OF THE DAY)